Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Holographic digital watermark










Image Number 5 for United States Patent #7551750.

A digital watermark which is incorporated, perceptibly or imperceptibly, into a diffractive device such as a hologram. When applied to protect and/or authenticate a document of value or a product, the device provides an increased degree of overt and covert security, and permits tracking of the sale, use or other parameters associated with the product and/or document of value.








 
 
  Recently Added Patents
Label printer
(4926
Testing apparatus and testing method for telephone apparatus
Hydrogen generation device and fuel cell system
Adding value to a rendered document
Polymorphic forms of 3-(1-{3-[5-(1-methyl-piperidin-4-ylmethoxy)-pyrimidin-2-yl]-benzyl}-6-oxo- -1,6-dihydro-pyridazin-3-yl)-benzonitrile hydrochloride salt and processes of manufacturing t
End-of-session authentication
  Randomly Featured Patents
Method for delivering an occlusion plug
Mode discrimination apparatus
Nondestructive electromagnetic inspection of pipelines incorporated in an electrically closed loop
Nuclear reactor vessel inspection system and method with remote transducer positioning
Method for membrane protection during reactive ion/plasma etching processing for via or cavity formation in semiconductor manufacture
Self powered jack carriage for moving disabled vehicles
Wood-type golf club
Spread spectrum receiver with multi-bit correlator
Gamma voltage generating apparatus using variable resistor for generating a plurality of gamma voltages in correspondence with various modes
Method for manufacturing semiconductor light emitting device